Summoner in need of eidolon Advice

[ThecrimeForceDragon]

Got a Summoner Idea
(Might go Synthesist But want to see what else may fit this character better)

Let's talk the eidolon first my idea is like living metal slime taking the form of a a large slime or a metal seperpent. The idea is if someone gets to close it can get spiky and stuff or turn whip like

How would I go about this

[Firebug]

Sounds like a base form: Serpentine, subtype: Protean to me. IE: Unchained Summoner.
Refluff improved natural armor as metallic plates (instead of bony plates). Maybe use the tentacles evolution to do the 'spiky' bits. Tail slap does the 'whip-like' part.

[ThecrimeForceDragon]

Firebug wrote:

Sounds like a base form: Serpentine, subtype: Protean to me. IE: Unchained Summoner.

Refluff improved natural armor as metallic plates (instead of bony plates). Maybe use the tentacles evolution to do the 'spiky' bits. Tail slap does the 'whip-like' part.

I though unchained was kinda of a down grade. At least I remeber some where seeing one of the unchained classes be a bit lack luster compared to it's reg version

I see

What sub class would you recommend ?

[Firebug]

Unchained for Summoner is a "downgrade" really only in the case of early access spells (like Haste as a 2nd level instead of 3rd) and complete freedom for the Eidolon evolutions and a few changes to the Evolution point costs (most notably, Pounce going to 3 from 1)

Unchained gets about half the Evolution points (26 vs 15), but gets a bunch of Evolutions for free depending on the Subtype choice.

Protean Unchained Example:

For example, the Protean I suggested gets Grab and Resistance(acid) for free at 1st(normally 2 and 1 points). Resist 10 (electric and sonic) at 4 (not exactly Resistance evolution, but let's call it 1 point each). Constrict at 8 (2 points). At 12: Damage Reduction 5/Lawful (3 points), Blindsense(3 points), wingless Flight (4 points). At 16: Resistance(Acid) turns into Immunity(Acid) (net 1 point), Amorphous Quality (4 points). At 20: Constant Freedom of Movement(not listed) and the Protean Change Shape ability(not listed).

So adding the free evolutions to the pool, Unchained is at least 39 points with 2 powerful un-costed abilities(freedom of movement and greater polymorph). Compared to 26 for Chained. But you have to want those free evolutions. And different Subtypes are locked into certain base forms.

Personally, the most OP part of either Summoner is the Summon Monster SLA, and it stayed the same.